ext2_vfsops.c revision 83366
154359Sroberto/* 254359Sroberto * modified for EXT2FS support in Lites 1.1 354359Sroberto * 454359Sroberto * Aug 1995, Godmar Back (gback@cs.utah.edu) 554359Sroberto * University of Utah, Department of Computer Science 682498Sroberto */ 782498Sroberto/* 882498Sroberto * Copyright (c) 1989, 1991, 1993, 1994 982498Sroberto * The Regents of the University of California. All rights reserved. 1082498Sroberto * 1182498Sroberto * Redistribution and use in source and binary forms, with or without 1254359Sroberto * modification, are permitted provided that the following conditions 1354359Sroberto * are met: 1454359Sroberto * 1. Redistributions of source code must retain the above copyright 1554359Sroberto * notice, this list of conditions and the following disclaimer. 1654359Sroberto * 2. Redistributions in binary form must reproduce the above copyright 1754359Sroberto * notice, this list of conditions and the following disclaimer in the 1854359Sroberto * documentation and/or other materials provided with the distribution. 1954359Sroberto * 3. All advertising materials mentioning features or use of this software 2054359Sroberto * must display the following acknowledgement: 2182498Sroberto * This product includes software developed by the University of 2254359Sroberto * California, Berkeley and its contributors. 2354359Sroberto * 4. Neither the name of the University nor the names of its contributors 2454359Sroberto * may be used to endorse or promote products derived from this software 2554359Sroberto * without specific prior written permission. 2654359Sroberto * 2754359Sroberto * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2854359Sroberto * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2954359Sroberto * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3054359Sroberto * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3154359Sroberto * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3254359Sroberto * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3354359Sroberto * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3454359Sroberto * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3554359Sroberto * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3654359Sroberto * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3754359Sroberto * SUCH DAMAGE. 3854359Sroberto * 3954359Sroberto * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 4054359Sroberto * $FreeBSD: head/sys/gnu/fs/ext2fs/ext2_vfsops.c 83366 2001-09-12 08:38:13Z julian $ 4154359Sroberto */ 4254359Sroberto 4354359Sroberto#include "opt_quota.h" 4454359Sroberto 4554359Sroberto#include <sys/param.h> 4654359Sroberto#include <sys/systm.h> 4754359Sroberto#include <sys/namei.h> 4854359Sroberto#include <sys/proc.h> 4954359Sroberto#include <sys/kernel.h> 5054359Sroberto#include <sys/vnode.h> 5154359Sroberto#include <sys/mount.h> 5254359Sroberto#include <sys/bio.h> 5354359Sroberto#include <sys/buf.h> 5454359Sroberto#include <sys/conf.h> 5554359Sroberto#include <sys/fcntl.h> 5654359Sroberto#include <sys/disklabel.h> 5754359Sroberto#include <sys/malloc.h> 5854359Sroberto#include <sys/stat.h> 5954359Sroberto#include <sys/mutex.h> 6054359Sroberto 6154359Sroberto#include <ufs/ufs/extattr.h> 6254359Sroberto#include <ufs/ufs/quota.h> 6354359Sroberto#include <ufs/ufs/ufsmount.h> 6454359Sroberto#include <ufs/ufs/inode.h> 6554359Sroberto#include <ufs/ufs/ufs_extern.h> 6654359Sroberto 6754359Sroberto 6854359Sroberto#include <gnu/ext2fs/fs.h> 6954359Sroberto#include <gnu/ext2fs/ext2_extern.h> 7054359Sroberto#include <gnu/ext2fs/ext2_fs.h> 7154359Sroberto#include <gnu/ext2fs/ext2_fs_sb.h> 7254359Sroberto 7354359Srobertostatic int ext2_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 7454359Srobertostatic int ext2_flushfiles __P((struct mount *mp, int flags, struct thread *td)); 7554359Srobertostatic int ext2_mount __P((struct mount *, 7654359Sroberto char *, caddr_t, struct nameidata *, struct thread *)); 7754359Srobertostatic int ext2_mountfs __P((struct vnode *, struct mount *, struct thread *)); 7854359Srobertostatic int ext2_reload __P((struct mount *mountp, struct ucred *cred, 7954359Sroberto struct thread *td)); 8054359Srobertostatic int ext2_sbupdate __P((struct ufsmount *, int)); 8154359Srobertostatic int ext2_statfs __P((struct mount *, struct statfs *, struct thread *)); 8254359Srobertostatic int ext2_sync __P((struct mount *, int, struct ucred *, struct thread *)); 8354359Srobertostatic int ext2_unmount __P((struct mount *, int, struct thread *)); 8454359Srobertostatic int ext2_vget __P((struct mount *, ino_t, struct vnode **)); 8554359Srobertostatic int ext2_vptofh __P((struct vnode *, struct fid *)); 8654359Sroberto 8754359Srobertostatic MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part"); 8854359Sroberto 8954359Srobertostatic struct vfsops ext2fs_vfsops = { 9054359Sroberto ext2_mount, 9154359Sroberto ufs_start, /* empty function */ 9254359Sroberto ext2_unmount, 9354359Sroberto ufs_root, /* root inode via vget */ 9454359Sroberto ufs_quotactl, /* does operations associated with quotas */ 9554359Sroberto ext2_statfs, 9654359Sroberto ext2_sync, 9754359Sroberto ext2_vget, 9854359Sroberto ext2_fhtovp, 9954359Sroberto vfs_stdcheckexp, 10054359Sroberto ext2_vptofh, 10154359Sroberto ext2_init, 10254359Sroberto vfs_stduninit, 10354359Sroberto vfs_stdextattrctl, 10454359Sroberto}; 10554359Sroberto 10654359SrobertoVFS_SET(ext2fs_vfsops, ext2fs, 0); 10754359Sroberto#define bsd_malloc malloc 10854359Sroberto#define bsd_free free 10954359Sroberto 11054359Srobertostatic int ext2fs_inode_hash_lock; 11154359Sroberto 11254359Srobertostatic int ext2_check_sb_compat __P((struct ext2_super_block *es, 11354359Sroberto dev_t dev, int ronly)); 11454359Srobertostatic int compute_sb_data __P((struct vnode * devvp, 11554359Sroberto struct ext2_super_block * es, 11654359Sroberto struct ext2_sb_info * fs)); 11754359Sroberto 11854359Sroberto#ifdef notyet 11954359Srobertostatic int ext2_mountroot __P((void)); 12054359Sroberto 12154359Sroberto/* 12254359Sroberto * Called by main() when ext2fs is going to be mounted as root. 12354359Sroberto * 12454359Sroberto * Name is updated by mount(8) after booting. 12554359Sroberto */ 12654359Sroberto#define ROOTNAME "root_device" 12754359Sroberto 12854359Srobertostatic int 12954359Srobertoext2_mountroot() 13054359Sroberto{ 13154359Sroberto register struct ext2_sb_info *fs; 13254359Sroberto register struct mount *mp; 13354359Sroberto struct thread *td = curthread; 13454359Sroberto struct ufsmount *ump; 13554359Sroberto u_int size; 13654359Sroberto int error; 13754359Sroberto 13854359Sroberto if ((error = bdevvp(rootdev, &rootvp))) { 13954359Sroberto printf("ext2_mountroot: can't find rootvp\n"); 14054359Sroberto return (error); 14154359Sroberto } 14254359Sroberto mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 14354359Sroberto bzero((char *)mp, (u_long)sizeof(struct mount)); 14454359Sroberto mp->mnt_op = &ext2fs_vfsops; 14554359Sroberto mp->mnt_flag = MNT_RDONLY; 14654359Sroberto if (error = ext2_mountfs(rootvp, mp, td)) { 14754359Sroberto bsd_free(mp, M_MOUNT); 14854359Sroberto return (error); 14954359Sroberto } 15054359Sroberto if (error = vfs_lock(mp)) { 15154359Sroberto (void)ext2_unmount(mp, 0, td); 15254359Sroberto bsd_free(mp, M_MOUNT); 15354359Sroberto return (error); 15454359Sroberto } 15554359Sroberto TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 15654359Sroberto mp->mnt_flag |= MNT_ROOTFS; 15754359Sroberto mp->mnt_vnodecovered = NULLVP; 15854359Sroberto ump = VFSTOUFS(mp); 15954359Sroberto fs = ump->um_e2fs; 16054359Sroberto bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 16154359Sroberto fs->fs_fsmnt[0] = '/'; 16254359Sroberto bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 16354359Sroberto MNAMELEN); 16454359Sroberto (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 16554359Sroberto &size); 16654359Sroberto bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 16754359Sroberto (void)ext2_statfs(mp, &mp->mnt_stat, td); 16854359Sroberto vfs_unlock(mp); 16954359Sroberto inittodr(fs->s_es->s_wtime); /* this helps to set the time */ 17054359Sroberto return (0); 17154359Sroberto} 17254359Sroberto#endif 17354359Sroberto 17454359Sroberto/* 17554359Sroberto * VFS Operations. 17654359Sroberto * 17754359Sroberto * mount system call 17854359Sroberto */ 17954359Srobertostatic int 18054359Srobertoext2_mount(mp, path, data, ndp, td) 18154359Sroberto register struct mount *mp; 18254359Sroberto char *path; 18354359Sroberto caddr_t data; /* this is actually a (struct ufs_args *) */ 18454359Sroberto struct nameidata *ndp; 18554359Sroberto struct thread *td; 18654359Sroberto{ 18754359Sroberto struct vnode *devvp; 18854359Sroberto struct ufs_args args; 18954359Sroberto struct ufsmount *ump = 0; 19054359Sroberto register struct ext2_sb_info *fs; 19154359Sroberto size_t size; 19254359Sroberto int error, flags; 19354359Sroberto mode_t accessmode; 19454359Sroberto 19554359Sroberto /* Double-check the length of path.. */ 19654359Sroberto if (strlen(path) >= MAXMNTLEN - 1) 19754359Sroberto return (ENAMETOOLONG); 19854359Sroberto error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 19954359Sroberto if (error != 0) 20054359Sroberto return (error); 20154359Sroberto /* 20254359Sroberto * If updating, check whether changing from read-only to 20354359Sroberto * read/write; if there is no device name, that's all we do. 20454359Sroberto */ 20554359Sroberto if (mp->mnt_flag & MNT_UPDATE) { 20654359Sroberto ump = VFSTOUFS(mp); 20754359Sroberto fs = ump->um_e2fs; 20854359Sroberto error = 0; 20954359Sroberto if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) { 21054359Sroberto flags = WRITECLOSE; 21154359Sroberto if (mp->mnt_flag & MNT_FORCE) 21254359Sroberto flags |= FORCECLOSE; 21354359Sroberto if (vfs_busy(mp, LK_NOWAIT, 0, td)) 21454359Sroberto return (EBUSY); 21554359Sroberto error = ext2_flushfiles(mp, flags, td); 21654359Sroberto vfs_unbusy(mp, td); 21754359Sroberto if (!error && fs->s_wasvalid) { 21854359Sroberto fs->s_es->s_state |= EXT2_VALID_FS; 21954359Sroberto ext2_sbupdate(ump, MNT_WAIT); 22054359Sroberto } 22154359Sroberto fs->s_rd_only = 1; 22254359Sroberto } 22354359Sroberto if (!error && (mp->mnt_flag & MNT_RELOAD)) 22454359Sroberto error = ext2_reload(mp, ndp->ni_cnd.cn_cred, td); 22554359Sroberto if (error) 22654359Sroberto return (error); 22754359Sroberto devvp = ump->um_devvp; 22854359Sroberto if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev, 22954359Sroberto (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0) 23054359Sroberto return (EPERM); 23154359Sroberto if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 23254359Sroberto /* 23354359Sroberto * If upgrade to read-write by non-root, then verify 23454359Sroberto * that user has necessary permissions on the device. 23554359Sroberto */ 23654359Sroberto if (suser_td(td)) { 23754359Sroberto vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 23854359Sroberto if ((error = VOP_ACCESS(devvp, VREAD | VWRITE, 23954359Sroberto td->td_proc->p_ucred, td)) != 0) { 24054359Sroberto VOP_UNLOCK(devvp, 0, td); 24154359Sroberto return (error); 24254359Sroberto } 24354359Sroberto VOP_UNLOCK(devvp, 0, td); 24454359Sroberto } 24554359Sroberto 24654359Sroberto if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 || 24754359Sroberto (fs->s_es->s_state & EXT2_ERROR_FS)) { 24854359Sroberto if (mp->mnt_flag & MNT_FORCE) { 24954359Sroberto printf( 25054359Sroberto"WARNING: %s was not properly dismounted\n", 25154359Sroberto fs->fs_fsmnt); 25254359Sroberto } else { 25354359Sroberto printf( 25454359Sroberto"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 25554359Sroberto fs->fs_fsmnt); 25654359Sroberto return (EPERM); 25754359Sroberto } 25854359Sroberto } 25954359Sroberto fs->s_es->s_state &= ~EXT2_VALID_FS; 26054359Sroberto ext2_sbupdate(ump, MNT_WAIT); 26154359Sroberto fs->s_rd_only = 0; 26254359Sroberto } 26354359Sroberto if (args.fspec == 0) { 26454359Sroberto /* 26554359Sroberto * Process export requests. 26654359Sroberto */ 26754359Sroberto return (vfs_export(mp, &args.export)); 26854359Sroberto } 26954359Sroberto } 27054359Sroberto /* 27154359Sroberto * Not an update, or updating the name: look up the name 27254359Sroberto * and verify that it refers to a sensible block device. 27354359Sroberto */ 27454359Sroberto NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 27554359Sroberto if ((error = namei(ndp)) != 0) 27654359Sroberto return (error); 27754359Sroberto NDFREE(ndp, NDF_ONLY_PNBUF); 27854359Sroberto devvp = ndp->ni_vp; 27954359Sroberto 28054359Sroberto if (!vn_isdisk(devvp, &error)) { 28154359Sroberto vrele(devvp); 28254359Sroberto return (error); 28354359Sroberto } 28454359Sroberto 28554359Sroberto /* 28654359Sroberto * If mount by non-root, then verify that user has necessary 28754359Sroberto * permissions on the device. 28854359Sroberto */ 28954359Sroberto if (suser_td(td)) { 29054359Sroberto accessmode = VREAD; 29154359Sroberto if ((mp->mnt_flag & MNT_RDONLY) == 0) 29254359Sroberto accessmode |= VWRITE; 29354359Sroberto vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 29454359Sroberto if ((error = VOP_ACCESS(devvp, accessmode, td->td_proc->p_ucred, td)) != 0) { 29554359Sroberto vput(devvp); 29654359Sroberto return (error); 29754359Sroberto } 29854359Sroberto VOP_UNLOCK(devvp, 0, td); 29954359Sroberto } 30054359Sroberto 30154359Sroberto if ((mp->mnt_flag & MNT_UPDATE) == 0) { 30254359Sroberto error = ext2_mountfs(devvp, mp, td); 30354359Sroberto } else { 30454359Sroberto if (devvp != ump->um_devvp) 30554359Sroberto error = EINVAL; /* needs translation */ 30654359Sroberto else 30754359Sroberto vrele(devvp); 30854359Sroberto } 30954359Sroberto if (error) { 31054359Sroberto vrele(devvp); 31154359Sroberto return (error); 31254359Sroberto } 31354359Sroberto ump = VFSTOUFS(mp); 31454359Sroberto fs = ump->um_e2fs; 31554359Sroberto /* 31654359Sroberto * Note that this strncpy() is ok because of a check at the start 31754359Sroberto * of ext2_mount(). 31854359Sroberto */ 31954359Sroberto strncpy(fs->fs_fsmnt, path, MAXMNTLEN); 32054359Sroberto fs->fs_fsmnt[MAXMNTLEN - 1] = '\0'; 32154359Sroberto (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 32254359Sroberto &size); 32354359Sroberto bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 32454359Sroberto (void)ext2_statfs(mp, &mp->mnt_stat, td); 32554359Sroberto return (0); 32654359Sroberto} 32754359Sroberto 32854359Sroberto/* 32954359Sroberto * checks that the data in the descriptor blocks make sense 33054359Sroberto * this is taken from ext2/super.c 33154359Sroberto */ 33254359Srobertostatic int ext2_check_descriptors (struct ext2_sb_info * sb) 33354359Sroberto{ 33454359Sroberto int i; 33554359Sroberto int desc_block = 0; 33654359Sroberto unsigned long block = sb->s_es->s_first_data_block; 33754359Sroberto struct ext2_group_desc * gdp = NULL; 33854359Sroberto 33954359Sroberto /* ext2_debug ("Checking group descriptors"); */ 34054359Sroberto 34154359Sroberto for (i = 0; i < sb->s_groups_count; i++) 34254359Sroberto { 34354359Sroberto /* examine next descriptor block */ 34454359Sroberto if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 34554359Sroberto gdp = (struct ext2_group_desc *) 34654359Sroberto sb->s_group_desc[desc_block++]->b_data; 34754359Sroberto if (gdp->bg_block_bitmap < block || 34854359Sroberto gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 34954359Sroberto { 35054359Sroberto printf ("ext2_check_descriptors: " 35154359Sroberto "Block bitmap for group %d" 35254359Sroberto " not in group (block %lu)!\n", 35354359Sroberto i, (unsigned long) gdp->bg_block_bitmap); 35454359Sroberto return 0; 35554359Sroberto } 35654359Sroberto if (gdp->bg_inode_bitmap < block || 35754359Sroberto gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 35854359Sroberto { 35954359Sroberto printf ("ext2_check_descriptors: " 36054359Sroberto "Inode bitmap for group %d" 36154359Sroberto " not in group (block %lu)!\n", 36254359Sroberto i, (unsigned long) gdp->bg_inode_bitmap); 36354359Sroberto return 0; 36454359Sroberto } 36554359Sroberto if (gdp->bg_inode_table < block || 36654359Sroberto gdp->bg_inode_table + sb->s_itb_per_group >= 36754359Sroberto block + EXT2_BLOCKS_PER_GROUP(sb)) 36854359Sroberto { 36954359Sroberto printf ("ext2_check_descriptors: " 37054359Sroberto "Inode table for group %d" 37154359Sroberto " not in group (block %lu)!\n", 37254359Sroberto i, (unsigned long) gdp->bg_inode_table); 37354359Sroberto return 0; 37454359Sroberto } 37554359Sroberto block += EXT2_BLOCKS_PER_GROUP(sb); 37654359Sroberto gdp++; 37754359Sroberto } 37854359Sroberto return 1; 37954359Sroberto} 38054359Sroberto 38154359Srobertostatic int 38254359Srobertoext2_check_sb_compat(es, dev, ronly) 38354359Sroberto struct ext2_super_block *es; 38454359Sroberto dev_t dev; 38554359Sroberto int ronly; 38654359Sroberto{ 38754359Sroberto 38854359Sroberto if (es->s_magic != EXT2_SUPER_MAGIC) { 38954359Sroberto printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 39054359Sroberto devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC); 39154359Sroberto return (1); 39254359Sroberto } 39354359Sroberto if (es->s_rev_level > EXT2_GOOD_OLD_REV) { 39454359Sroberto if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) { 39554359Sroberto printf( 39654359Sroberto"WARNING: mount of %s denied due to unsupported optional features\n", 39754359Sroberto devtoname(dev)); 39854359Sroberto return (1); 39954359Sroberto } 40054359Sroberto if (!ronly && 40154359Sroberto (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) { 40254359Sroberto printf( 40354359Sroberto"WARNING: R/W mount of %s denied due to unsupported optional features\n", 40454359Sroberto devtoname(dev)); 40554359Sroberto return (1); 40654359Sroberto } 40754359Sroberto } 40854359Sroberto return (0); 40954359Sroberto} 41054359Sroberto 41154359Sroberto/* 41254359Sroberto * this computes the fields of the ext2_sb_info structure from the 41354359Sroberto * data in the ext2_super_block structure read in 41454359Sroberto */ 41554359Srobertostatic int compute_sb_data(devvp, es, fs) 41654359Sroberto struct vnode * devvp; 41754359Sroberto struct ext2_super_block * es; 41854359Sroberto struct ext2_sb_info * fs; 41954359Sroberto{ 42054359Sroberto int db_count, error; 42154359Sroberto int i, j; 42254359Sroberto int logic_sb_block = 1; /* XXX for now */ 42354359Sroberto 42454359Sroberto#if 1 42554359Sroberto#define V(v) 42654359Sroberto#else 42754359Sroberto#define V(v) printf(#v"= %d\n", fs->v); 42854359Sroberto#endif 42954359Sroberto 43054359Sroberto fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size; 43154359Sroberto V(s_blocksize) 43254359Sroberto fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size; 43354359Sroberto V(s_bshift) 43454359Sroberto fs->s_fsbtodb = es->s_log_block_size + 1; 43554359Sroberto V(s_fsbtodb) 43654359Sroberto fs->s_qbmask = fs->s_blocksize - 1; 43754359Sroberto V(s_bmask) 43854359Sroberto fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es); 43954359Sroberto V(s_blocksize_bits) 44054359Sroberto fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size; 44154359Sroberto V(s_frag_size) 44254359Sroberto if (fs->s_frag_size) 44354359Sroberto fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size; 44454359Sroberto V(s_frags_per_block) 44554359Sroberto fs->s_blocks_per_group = es->s_blocks_per_group; 44654359Sroberto V(s_blocks_per_group) 44754359Sroberto fs->s_frags_per_group = es->s_frags_per_group; 44854359Sroberto V(s_frags_per_group) 44954359Sroberto fs->s_inodes_per_group = es->s_inodes_per_group; 45054359Sroberto V(s_inodes_per_group) 45154359Sroberto fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE; 45254359Sroberto V(s_inodes_per_block) 45354359Sroberto fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block; 45454359Sroberto V(s_itb_per_group) 45554359Sroberto fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc); 45654359Sroberto V(s_desc_per_block) 45754359Sroberto /* s_resuid / s_resgid ? */ 45854359Sroberto fs->s_groups_count = (es->s_blocks_count - 45954359Sroberto es->s_first_data_block + 46054359Sroberto EXT2_BLOCKS_PER_GROUP(fs) - 1) / 46154359Sroberto EXT2_BLOCKS_PER_GROUP(fs); 46254359Sroberto V(s_groups_count) 46354359Sroberto db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) / 46454359Sroberto EXT2_DESC_PER_BLOCK(fs); 46554359Sroberto fs->s_db_per_group = db_count; 46654359Sroberto V(s_db_per_group) 46754359Sroberto 46854359Sroberto fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *), 46954359Sroberto M_UFSMNT, M_WAITOK); 47054359Sroberto 47154359Sroberto /* adjust logic_sb_block */ 47254359Sroberto if(fs->s_blocksize > SBSIZE) 47354359Sroberto /* Godmar thinks: if the blocksize is greater than 1024, then 47454359Sroberto the superblock is logically part of block zero. 47554359Sroberto */ 47654359Sroberto logic_sb_block = 0; 47754359Sroberto 47854359Sroberto for (i = 0; i < db_count; i++) { 47954359Sroberto error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1), 48054359Sroberto fs->s_blocksize, NOCRED, &fs->s_group_desc[i]); 48154359Sroberto if(error) { 48254359Sroberto for (j = 0; j < i; j++) 48354359Sroberto brelse(fs->s_group_desc[j]); 48454359Sroberto bsd_free(fs->s_group_desc, M_UFSMNT); 48554359Sroberto printf("EXT2-fs: unable to read group descriptors (%d)\n", error); 48654359Sroberto return EIO; 48754359Sroberto } 48854359Sroberto /* Set the B_LOCKED flag on the buffer, then brelse() it */ 48954359Sroberto LCK_BUF(fs->s_group_desc[i]) 49054359Sroberto } 49154359Sroberto if(!ext2_check_descriptors(fs)) { 49254359Sroberto for (j = 0; j < db_count; j++) 49354359Sroberto ULCK_BUF(fs->s_group_desc[j]) 49454359Sroberto bsd_free(fs->s_group_desc, M_UFSMNT); 49554359Sroberto printf("EXT2-fs: (ext2_check_descriptors failure) " 49654359Sroberto "unable to read group descriptors\n"); 49754359Sroberto return EIO; 49854359Sroberto } 49954359Sroberto 50054359Sroberto for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) { 50154359Sroberto fs->s_inode_bitmap_number[i] = 0; 50254359Sroberto fs->s_inode_bitmap[i] = NULL; 50354359Sroberto fs->s_block_bitmap_number[i] = 0; 50454359Sroberto fs->s_block_bitmap[i] = NULL; 50554359Sroberto } 506 fs->s_loaded_inode_bitmaps = 0; 507 fs->s_loaded_block_bitmaps = 0; 508 return 0; 509} 510 511/* 512 * Reload all incore data for a filesystem (used after running fsck on 513 * the root filesystem and finding things to fix). The filesystem must 514 * be mounted read-only. 515 * 516 * Things to do to update the mount: 517 * 1) invalidate all cached meta-data. 518 * 2) re-read superblock from disk. 519 * 3) re-read summary information from disk. 520 * 4) invalidate all inactive vnodes. 521 * 5) invalidate all cached file data. 522 * 6) re-read inode data for all active vnodes. 523 */ 524static int 525ext2_reload(mountp, cred, td) 526 register struct mount *mountp; 527 struct ucred *cred; 528 struct thread *td; 529{ 530 register struct vnode *vp, *nvp, *devvp; 531 struct inode *ip; 532 struct buf *bp; 533 struct ext2_super_block * es; 534 struct ext2_sb_info *fs; 535 int error; 536 537 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 538 return (EINVAL); 539 /* 540 * Step 1: invalidate all cached meta-data. 541 */ 542 devvp = VFSTOUFS(mountp)->um_devvp; 543 if (vinvalbuf(devvp, 0, cred, td, 0, 0)) 544 panic("ext2_reload: dirty1"); 545 /* 546 * Step 2: re-read superblock from disk. 547 * constants have been adjusted for ext2 548 */ 549 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 550 return (error); 551 es = (struct ext2_super_block *)bp->b_data; 552 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 553 brelse(bp); 554 return (EIO); /* XXX needs translation */ 555 } 556 fs = VFSTOUFS(mountp)->um_e2fs; 557 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block)); 558 559 if((error = compute_sb_data(devvp, es, fs)) != 0) { 560 brelse(bp); 561 return error; 562 } 563#ifdef UNKLAR 564 if (fs->fs_sbsize < SBSIZE) 565 bp->b_flags |= B_INVAL; 566#endif 567 brelse(bp); 568 569loop: 570 mtx_lock(&mntvnode_mtx); 571 for (vp = LIST_FIRST(&mountp->mnt_vnodelist); vp != NULL; vp = nvp) { 572 if (vp->v_mount != mountp) { 573 mtx_unlock(&mntvnode_mtx); 574 goto loop; 575 } 576 nvp = LIST_NEXT(vp, v_mntvnodes); 577 mtx_unlock(&mntvnode_mtx); 578 /* 579 * Step 4: invalidate all inactive vnodes. 580 */ 581 if (vrecycle(vp, NULL, td)) 582 goto loop; 583 /* 584 * Step 5: invalidate all cached file data. 585 */ 586 mtx_lock(&vp->v_interlock); 587 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 588 goto loop; 589 } 590 if (vinvalbuf(vp, 0, cred, td, 0, 0)) 591 panic("ext2_reload: dirty2"); 592 /* 593 * Step 6: re-read inode data for all active vnodes. 594 */ 595 ip = VTOI(vp); 596 error = 597 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 598 (int)fs->s_blocksize, NOCRED, &bp); 599 if (error) { 600 vput(vp); 601 return (error); 602 } 603 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + 604 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), 605 &ip->i_din); 606 brelse(bp); 607 vput(vp); 608 mtx_lock(&mntvnode_mtx); 609 } 610 mtx_unlock(&mntvnode_mtx); 611 return (0); 612} 613 614/* 615 * Common code for mount and mountroot 616 */ 617static int 618ext2_mountfs(devvp, mp, td) 619 register struct vnode *devvp; 620 struct mount *mp; 621 struct thread *td; 622{ 623 register struct ufsmount *ump; 624 struct buf *bp; 625 register struct ext2_sb_info *fs; 626 struct ext2_super_block * es; 627 dev_t dev = devvp->v_rdev; 628 struct partinfo dpart; 629 int havepart = 0; 630 int error, i, size; 631 int ronly; 632 633 /* 634 * Disallow multiple mounts of the same device. 635 * Disallow mounting of a device that is currently in use 636 * (except for root, which might share swap device for miniroot). 637 * Flush out any old buffers remaining from a previous use. 638 */ 639 if ((error = vfs_mountedon(devvp)) != 0) 640 return (error); 641 if (vcount(devvp) > 1 && devvp != rootvp) 642 return (EBUSY); 643 if ((error = vinvalbuf(devvp, V_SAVE, td->td_proc->p_ucred, td, 0, 0)) != 0) 644 return (error); 645#ifdef READONLY 646/* turn on this to force it to be read-only */ 647 mp->mnt_flag |= MNT_RDONLY; 648#endif 649 650 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 651 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 652 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 653 VOP_UNLOCK(devvp, 0, td); 654 if (error) 655 return (error); 656 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, td) != 0) 657 size = DEV_BSIZE; 658 else { 659 havepart = 1; 660 size = dpart.disklab->d_secsize; 661 } 662 663 bp = NULL; 664 ump = NULL; 665 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 666 goto out; 667 es = (struct ext2_super_block *)bp->b_data; 668 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 669 error = EINVAL; /* XXX needs translation */ 670 goto out; 671 } 672 if ((es->s_state & EXT2_VALID_FS) == 0 || 673 (es->s_state & EXT2_ERROR_FS)) { 674 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 675 printf( 676"WARNING: Filesystem was not properly dismounted\n"); 677 } else { 678 printf( 679"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 680 error = EPERM; 681 goto out; 682 } 683 } 684 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 685 bzero((caddr_t)ump, sizeof *ump); 686 ump->um_malloctype = M_EXT2NODE; 687 ump->um_blkatoff = ext2_blkatoff; 688 ump->um_truncate = ext2_truncate; 689 ump->um_update = ext2_update; 690 ump->um_valloc = ext2_valloc; 691 ump->um_vfree = ext2_vfree; 692 /* I don't know whether this is the right strategy. Note that 693 we dynamically allocate both a ext2_sb_info and a ext2_super_block 694 while Linux keeps the super block in a locked buffer 695 */ 696 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info), 697 M_UFSMNT, M_WAITOK); 698 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block), 699 M_UFSMNT, M_WAITOK); 700 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block)); 701 if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs))) 702 goto out; 703 /* 704 * We don't free the group descriptors allocated by compute_sb_data() 705 * until ext2_unmount(). This is OK since the mount will succeed. 706 */ 707 brelse(bp); 708 bp = NULL; 709 fs = ump->um_e2fs; 710 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */ 711 /* if the fs is not mounted read-only, make sure the super block is 712 always written back on a sync() 713 */ 714 fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0; 715 if (ronly == 0) { 716 fs->s_dirt = 1; /* mark it modified */ 717 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */ 718 } 719 mp->mnt_data = (qaddr_t)ump; 720 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 721 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 722 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 723 mp->mnt_flag |= MNT_LOCAL; 724 ump->um_mountp = mp; 725 ump->um_dev = dev; 726 ump->um_devvp = devvp; 727 /* setting those two parameters allows us to use 728 ufs_bmap w/o changse ! 729 */ 730 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 731 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1; 732 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 733 for (i = 0; i < MAXQUOTAS; i++) 734 ump->um_quotas[i] = NULLVP; 735 devvp->v_rdev->si_mountpoint = mp; 736 if (ronly == 0) 737 ext2_sbupdate(ump, MNT_WAIT); 738 return (0); 739out: 740 if (bp) 741 brelse(bp); 742 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, td); 743 if (ump) { 744 bsd_free(ump->um_e2fs->s_es, M_UFSMNT); 745 bsd_free(ump->um_e2fs, M_UFSMNT); 746 bsd_free(ump, M_UFSMNT); 747 mp->mnt_data = (qaddr_t)0; 748 } 749 return (error); 750} 751 752/* 753 * unmount system call 754 */ 755static int 756ext2_unmount(mp, mntflags, td) 757 struct mount *mp; 758 int mntflags; 759 struct thread *td; 760{ 761 register struct ufsmount *ump; 762 register struct ext2_sb_info *fs; 763 int error, flags, ronly, i; 764 765 flags = 0; 766 if (mntflags & MNT_FORCE) { 767 if (mp->mnt_flag & MNT_ROOTFS) 768 return (EINVAL); 769 flags |= FORCECLOSE; 770 } 771 if ((error = ext2_flushfiles(mp, flags, td)) != 0) 772 return (error); 773 ump = VFSTOUFS(mp); 774 fs = ump->um_e2fs; 775 ronly = fs->s_rd_only; 776 if (ronly == 0) { 777 if (fs->s_wasvalid) 778 fs->s_es->s_state |= EXT2_VALID_FS; 779 ext2_sbupdate(ump, MNT_WAIT); 780 } 781 782 /* release buffers containing group descriptors */ 783 for(i = 0; i < fs->s_db_per_group; i++) 784 ULCK_BUF(fs->s_group_desc[i]) 785 bsd_free(fs->s_group_desc, M_UFSMNT); 786 787 /* release cached inode/block bitmaps */ 788 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 789 if (fs->s_inode_bitmap[i]) 790 ULCK_BUF(fs->s_inode_bitmap[i]) 791 792 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 793 if (fs->s_block_bitmap[i]) 794 ULCK_BUF(fs->s_block_bitmap[i]) 795 796 ump->um_devvp->v_rdev->si_mountpoint = NULL; 797 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 798 NOCRED, td); 799 vrele(ump->um_devvp); 800 bsd_free(fs->s_es, M_UFSMNT); 801 bsd_free(fs, M_UFSMNT); 802 bsd_free(ump, M_UFSMNT); 803 mp->mnt_data = (qaddr_t)0; 804 mp->mnt_flag &= ~MNT_LOCAL; 805 return (error); 806} 807 808/* 809 * Flush out all the files in a filesystem. 810 */ 811static int 812ext2_flushfiles(mp, flags, td) 813 register struct mount *mp; 814 int flags; 815 struct thread *td; 816{ 817 register struct ufsmount *ump; 818 int error; 819#if QUOTA 820 int i; 821#endif 822 823 ump = VFSTOUFS(mp); 824#if QUOTA 825 if (mp->mnt_flag & MNT_QUOTA) { 826 if ((error = vflush(mp, 0, SKIPSYSTEM|flags)) != 0) 827 return (error); 828 for (i = 0; i < MAXQUOTAS; i++) { 829 if (ump->um_quotas[i] == NULLVP) 830 continue; 831 quotaoff(td, mp, i); 832 } 833 /* 834 * Here we fall through to vflush again to ensure 835 * that we have gotten rid of all the system vnodes. 836 */ 837 } 838#endif 839 error = vflush(mp, 0, flags); 840 return (error); 841} 842 843/* 844 * Get file system statistics. 845 * taken from ext2/super.c ext2_statfs 846 */ 847static int 848ext2_statfs(mp, sbp, td) 849 struct mount *mp; 850 register struct statfs *sbp; 851 struct thread *td; 852{ 853 unsigned long overhead; 854 register struct ufsmount *ump; 855 register struct ext2_sb_info *fs; 856 register struct ext2_super_block *es; 857 int i, nsb; 858 859 ump = VFSTOUFS(mp); 860 fs = ump->um_e2fs; 861 es = fs->s_es; 862 863 if (es->s_magic != EXT2_SUPER_MAGIC) 864 panic("ext2_statfs - magic number spoiled"); 865 866 /* 867 * Compute the overhead (FS structures) 868 */ 869 if (es->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) { 870 nsb = 0; 871 for (i = 0 ; i < fs->s_groups_count; i++) 872 if (ext2_group_sparse(i)) 873 nsb++; 874 } else 875 nsb = fs->s_groups_count; 876 overhead = es->s_first_data_block + 877 /* Superblocks and block group descriptors: */ 878 nsb * (1 + fs->s_db_per_group) + 879 /* Inode bitmap, block bitmap, and inode table: */ 880 fs->s_groups_count * (1 + 1 + fs->s_itb_per_group); 881 882 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 883 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 884 sbp->f_blocks = es->s_blocks_count - overhead; 885 sbp->f_bfree = es->s_free_blocks_count; 886 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count; 887 sbp->f_files = es->s_inodes_count; 888 sbp->f_ffree = es->s_free_inodes_count; 889 if (sbp != &mp->mnt_stat) { 890 sbp->f_type = mp->mnt_vfc->vfc_typenum; 891 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 892 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 893 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 894 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 895 } 896 return (0); 897} 898 899/* 900 * Go through the disk queues to initiate sandbagged IO; 901 * go through the inodes to write those that have been modified; 902 * initiate the writing of the super block if it has been modified. 903 * 904 * Note: we are always called with the filesystem marked `MPBUSY'. 905 */ 906static int 907ext2_sync(mp, waitfor, cred, td) 908 struct mount *mp; 909 int waitfor; 910 struct ucred *cred; 911 struct thread *td; 912{ 913 struct vnode *nvp, *vp; 914 struct inode *ip; 915 struct ufsmount *ump = VFSTOUFS(mp); 916 struct ext2_sb_info *fs; 917 int error, allerror = 0; 918 919 fs = ump->um_e2fs; 920 if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */ 921 printf("fs = %s\n", fs->fs_fsmnt); 922 panic("ext2_sync: rofs mod"); 923 } 924 /* 925 * Write back each (modified) inode. 926 */ 927 mtx_lock(&mntvnode_mtx); 928loop: 929 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) { 930 /* 931 * If the vnode that we are about to sync is no longer 932 * associated with this mount point, start over. 933 */ 934 if (vp->v_mount != mp) 935 goto loop; 936 nvp = LIST_NEXT(vp, v_mntvnodes); 937 mtx_unlock(&mntvnode_mtx); 938 mtx_lock(&vp->v_interlock); 939 ip = VTOI(vp); 940 if (vp->v_type == VNON || 941 ((ip->i_flag & 942 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 943 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 944 mtx_unlock(&vp->v_interlock); 945 mtx_lock(&mntvnode_mtx); 946 continue; 947 } 948 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 949 if (error) { 950 mtx_lock(&mntvnode_mtx); 951 if (error == ENOENT) 952 goto loop; 953 continue; 954 } 955 if ((error = VOP_FSYNC(vp, cred, waitfor, td)) != 0) 956 allerror = error; 957 VOP_UNLOCK(vp, 0, td); 958 vrele(vp); 959 mtx_lock(&mntvnode_mtx); 960 } 961 mtx_unlock(&mntvnode_mtx); 962 /* 963 * Force stale file system control information to be flushed. 964 */ 965 if (waitfor != MNT_LAZY) { 966 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td); 967 if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, td)) != 0) 968 allerror = error; 969 VOP_UNLOCK(ump->um_devvp, 0, td); 970 } 971#if QUOTA 972 qsync(mp); 973#endif 974 /* 975 * Write back modified superblock. 976 */ 977 if (fs->s_dirt != 0) { 978 fs->s_dirt = 0; 979 fs->s_es->s_wtime = time_second; 980 if ((error = ext2_sbupdate(ump, waitfor)) != 0) 981 allerror = error; 982 } 983 return (allerror); 984} 985 986/* 987 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it 988 * in from disk. If it is in core, wait for the lock bit to clear, then 989 * return the inode locked. Detection and handling of mount points must be 990 * done by the calling routine. 991 */ 992static int 993ext2_vget(mp, ino, vpp) 994 struct mount *mp; 995 ino_t ino; 996 struct vnode **vpp; 997{ 998 register struct ext2_sb_info *fs; 999 register struct inode *ip; 1000 struct ufsmount *ump; 1001 struct buf *bp; 1002 struct vnode *vp; 1003 dev_t dev; 1004 int i, error; 1005 int used_blocks; 1006 1007 ump = VFSTOUFS(mp); 1008 dev = ump->um_dev; 1009restart: 1010 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 1011 return (0); 1012 1013 /* 1014 * Lock out the creation of new entries in the FFS hash table in 1015 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate 1016 * may occur! 1017 */ 1018 if (ext2fs_inode_hash_lock) { 1019 while (ext2fs_inode_hash_lock) { 1020 ext2fs_inode_hash_lock = -1; 1021 tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0); 1022 } 1023 goto restart; 1024 } 1025 ext2fs_inode_hash_lock = 1; 1026 1027 /* 1028 * If this MALLOC() is performed after the getnewvnode() 1029 * it might block, leaving a vnode with a NULL v_data to be 1030 * found by ext2_sync() if a sync happens to fire right then, 1031 * which will cause a panic because ext2_sync() blindly 1032 * dereferences vp->v_data (as well it should). 1033 */ 1034 MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK); 1035 1036 /* Allocate a new vnode/inode. */ 1037 if ((error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) != 0) { 1038 if (ext2fs_inode_hash_lock < 0) 1039 wakeup(&ext2fs_inode_hash_lock); 1040 ext2fs_inode_hash_lock = 0; 1041 *vpp = NULL; 1042 FREE(ip, M_EXT2NODE); 1043 return (error); 1044 } 1045 bzero((caddr_t)ip, sizeof(struct inode)); 1046 lockinit(&vp->v_lock, PINOD, "ext2in", 0, 0); 1047 vp->v_data = ip; 1048 ip->i_vnode = vp; 1049 ip->i_e2fs = fs = ump->um_e2fs; 1050 ip->i_dev = dev; 1051 ip->i_number = ino; 1052#if QUOTA 1053 for (i = 0; i < MAXQUOTAS; i++) 1054 ip->i_dquot[i] = NODQUOT; 1055#endif 1056 /* 1057 * Put it onto its hash chain and lock it so that other requests for 1058 * this inode will block if they arrive while we are sleeping waiting 1059 * for old data structures to be purged or for the contents of the 1060 * disk portion of this inode to be read. 1061 */ 1062 ufs_ihashins(ip); 1063 1064 if (ext2fs_inode_hash_lock < 0) 1065 wakeup(&ext2fs_inode_hash_lock); 1066 ext2fs_inode_hash_lock = 0; 1067 1068 /* Read in the disk contents for the inode, copy into the inode. */ 1069#if 0 1070printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino))); 1071#endif 1072 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1073 (int)fs->s_blocksize, NOCRED, &bp)) != 0) { 1074 /* 1075 * The inode does not contain anything useful, so it would 1076 * be misleading to leave it on its hash chain. With mode 1077 * still zero, it will be unlinked and returned to the free 1078 * list by vput(). 1079 */ 1080 vput(vp); 1081 brelse(bp); 1082 *vpp = NULL; 1083 return (error); 1084 } 1085 /* convert ext2 inode to dinode */ 1086 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE * 1087 ino_to_fsbo(fs, ino)), &ip->i_din); 1088 ip->i_block_group = ino_to_cg(fs, ino); 1089 ip->i_next_alloc_block = 0; 1090 ip->i_next_alloc_goal = 0; 1091 ip->i_prealloc_count = 0; 1092 ip->i_prealloc_block = 0; 1093 /* now we want to make sure that block pointers for unused 1094 blocks are zeroed out - ext2_balloc depends on this 1095 although for regular files and directories only 1096 */ 1097 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 1098 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize; 1099 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1100 ip->i_db[i] = 0; 1101 } 1102/* 1103 ext2_print_inode(ip); 1104*/ 1105 brelse(bp); 1106 1107 /* 1108 * Initialize the vnode from the inode, check for aliases. 1109 * Note that the underlying vnode may have changed. 1110 */ 1111 if ((error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) != 0) { 1112 vput(vp); 1113 *vpp = NULL; 1114 return (error); 1115 } 1116 /* 1117 * Finish inode initialization now that aliasing has been resolved. 1118 */ 1119 ip->i_devvp = ump->um_devvp; 1120 VREF(ip->i_devvp); 1121 /* 1122 * Set up a generation number for this inode if it does not 1123 * already have one. This should only happen on old filesystems. 1124 */ 1125 if (ip->i_gen == 0) { 1126 ip->i_gen = random() / 2 + 1; 1127 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1128 ip->i_flag |= IN_MODIFIED; 1129 } 1130 *vpp = vp; 1131 return (0); 1132} 1133 1134/* 1135 * File handle to vnode 1136 * 1137 * Have to be really careful about stale file handles: 1138 * - check that the inode number is valid 1139 * - call ext2_vget() to get the locked inode 1140 * - check for an unallocated inode (i_mode == 0) 1141 * - check that the given client host has export rights and return 1142 * those rights via. exflagsp and credanonp 1143 */ 1144static int 1145ext2_fhtovp(mp, fhp, vpp) 1146 register struct mount *mp; 1147 struct fid *fhp; 1148 struct vnode **vpp; 1149{ 1150 register struct ufid *ufhp; 1151 struct ext2_sb_info *fs; 1152 1153 ufhp = (struct ufid *)fhp; 1154 fs = VFSTOUFS(mp)->um_e2fs; 1155 if (ufhp->ufid_ino < ROOTINO || 1156 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group) 1157 return (ESTALE); 1158 return (ufs_fhtovp(mp, ufhp, vpp)); 1159} 1160 1161/* 1162 * Vnode pointer to File handle 1163 */ 1164/* ARGSUSED */ 1165static int 1166ext2_vptofh(vp, fhp) 1167 struct vnode *vp; 1168 struct fid *fhp; 1169{ 1170 register struct inode *ip; 1171 register struct ufid *ufhp; 1172 1173 ip = VTOI(vp); 1174 ufhp = (struct ufid *)fhp; 1175 ufhp->ufid_len = sizeof(struct ufid); 1176 ufhp->ufid_ino = ip->i_number; 1177 ufhp->ufid_gen = ip->i_gen; 1178 return (0); 1179} 1180 1181/* 1182 * Write a superblock and associated information back to disk. 1183 */ 1184static int 1185ext2_sbupdate(mp, waitfor) 1186 struct ufsmount *mp; 1187 int waitfor; 1188{ 1189 register struct ext2_sb_info *fs = mp->um_e2fs; 1190 register struct ext2_super_block *es = fs->s_es; 1191 register struct buf *bp; 1192 int error = 0; 1193/* 1194printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no"); 1195*/ 1196 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 1197 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block)); 1198 if (waitfor == MNT_WAIT) 1199 error = bwrite(bp); 1200 else 1201 bawrite(bp); 1202 1203 /* 1204 * The buffers for group descriptors, inode bitmaps and block bitmaps 1205 * are not busy at this point and are (hopefully) written by the 1206 * usual sync mechanism. No need to write them here 1207 */ 1208 1209 return (error); 1210} 1211